Delayed development may "foster food sharing, behavioral flexibility, complicated communication, matrilineal groupings, female-centric society, and highly tolerant interaction patterns." (Kuroda 1989). At 10 months may wander up to 4 m (13 ft). At 6 months venture up to 1 m (3.3 feet) away. For the first three months not seen leaving mother. Bonobo infants grow more slowly than chimpanzee infants, both physically and behaviorally. Weight of four newborns studied at San Diego Zoo: 1.27 kg (2.8 lb). Bonobos may typically have more abundant food resources in their wild habitats and they are also not subordinate to males, so there is little cost to them in being in groups that include males. Chimpanzee females may seek to limit their time in groups with males due to the increased difficulty in obtaining food since males are strongly dominant. Bonobo females may be found with in mixed-sex parties, regardless of the condition of their genital swelling. Menstrual cycles in most published studies show considerable variation for bonobos. Time between menstrual cycles averaged around 33.8 days for six bonobos studied in managed care. (Vervaecke et al 1999) (Reichert et al 2002) Visible swelling cycles do not correlate exactly with the menstrual and ovulation cycles, but these visible signs are the ones often documented in field studies as indicators of sexual phase. Chimpanzee females tend to be sexually active only during their maximum swelling phase. Bonobos also engage in sex in non-swelling phases of their cycle in about 1 out of 3 copulations. 
This trait has sometimes been called concealed ovulation because the male has no clear signal for the optimum time for mating.Bonobos are sexually receptive for a large portion of their reproductive cycle, even when not near the time for ovulation.
In chimpanzees, the maximum swelling period is 2 or 3 days less.In bonobos, times of maximum genital swellings last about 13.4 days (Paoli et al 2006).In chimpanzees and bonobos these swellings coincide with times of heightened fertility.
Female bonobos, like chimpanzees, have pink genital swellings that appear attractive to males.
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